Division 2.3.4 Additional Classification ConsiderationsF1 United Kingdom Original text. Later amendments are not shown. 2.3.4.1The chemical heat of combustion (ΔΗ c ), in kilojoules per gram (kJ/g), is the product of the theoretical heat of combustion (ΔΗ comb ), and a combustion efficiency, usually less than 1,0 (a typical combustion efficiency is 0,95 or 95 %). Annotations Textual amendments F1 Substituted by Commission Regulation (EU) No 487/2013 of 8 May 2013 amending, for the purposes of its adaptation to technical and scientific progress, Regulation (EC) No 1272/2008 of the European Parliament and of the Council on classification, labelling and packaging of substances and mixtures (Text with EEA relevance). ← Division 2.3.3 Division 2.3.4 Division 2.3.4.1 →